Rotary kilns



March 25 1924.`

H. HOLZWARTH PROCESS AND APPARATUS FOR HEATING ROTARY KILNS FiledMarch 1. 1922 2 muti-Shut l r rain/frs Marsh lfy 1,488,248

H HQLZWARTH PROESS AND APFMA'US TOR HEATENG EOTARY KILNS Filed. Mwah 11922 2 Sheets-Shea?. S

BY [SMM Patented Mer. 2,5,` 1924. A

Letze.

l' eminem) ,errno-Doors 'corirona'rio'rt o'r mwN-mmHg, MIiq'i'nsoa'a,4le ggg- 'roenmonr or" DELAWARE.

To ull-'wilma' it may concern.' i v 4 Be it known that I, .HANSHoiizwnirrma eitizeii of Germany, resident ofMullieiniori-tlie-Ruhr,Germany, have invented a cei- I tainiiew anduseful Improvement in Processes'ja'nd Apparatus for -Heating RotaryKilhs, of whieli the following is a speoiiioa# tlOl'l;V i f l My presentinvention relates to tlieheat-y inggofd'iotary kilns, and has beendevised part arly Afor the externa-l heating of rotaryokilnsiservingfor'the distillation ofA coal ,ande other bituminous materials! .Foroperations-of. this Character, comparatively 16 lowitentpeisatures gareemployed, andvell'z...

speccixil; 'requirements must he f observe First of all, the temperatureof the kiln Wall,F tlironghoutitlie length .of thelrilinsliould beApplication nien: March 1',

as u niiform as possible within the limitsl of 20 about; 450, and 500centigrade.; at no point taken :to: avoid 'fainyi Ilocal exoeissiwelieating Again, it-

of tliefiltiln walilt redtheat desirable thatl the material undertreatment,

whiehjowingto the rotation of the. kiln as? a heating `device 0 2 is ahorizontal sectionl substantially on line vQ-- of Fig. 1, and Fig. 3' isa sectional view similar to Fig. 1,Y illustrating another foi-inA oftlieiheating device. i

Thelfurnaee proper or combustion clrain- 5 bei' (i is located at a distance frein-the rotary' kiln or drum b. This furnace eonsistsof a.

'at a high temperature in a practically coin` plete manner.4 The fuelmay hesolid (coal, semi-colte,

placed one grate a', or I inay use coal-dust or other powdered fuel,oiliquid or ygaseous fuel, for which purpose a nozzle o" has beencoiitlicting conditions, and

is shown in theA4 t of inutile in which the fuel* is consumed' lignite,ete.) and used in lumpsl together. vThe liot products conduit-.miliowalls of wliie 'ehargedagainst the (iron) will `.f/- in the directionindieated'by the arrow;

e, f, 1yill strike Athe ascendingportioiiwof,ttig@ tkilnevii vwhich theli'tillc of the nniterii'il l" and gaseous. cui-'rent toinipin'ge'agairistfl wall, particularly by givinglsaittieondilittfg?ideseending portion, as indiea-tdintFi- .W The conduit e ispi'eferably'llocatedf it plane perpendicular .to "1tlie loitgitnlleigfnl ol' theliih llie'feqiitl'tiit re proaelies the hiln,'and hasinlets dd eohl or moderately lnelieateil faiisetting. The tonguef extensq'uiteel a that'the heating.,r gases issuing tliro'ugl'i'rtlig'Channels h, i.-lret\\'een the led'ges or tongkuw The combustion gases pi'oducedinwtlie :fuif-P nace a have a` feinl'ieratue Yof :iloutk'lcentigrade'. This "teniperatu're4 is lno down" to about 7509 eentigiadeby the air a l initted ftlirougli xthe inlets The oooliiL etl'eetoffthis air i'nay be i'egiilated by Vviii-y"- ing its temperature, thatis, I may` employ either cool air,

or air preheated to a degree roportioned to the effect to be obtained,gut in any event only moderate reheating of the air would be employed.'l e cooling effect of the air may also be regulated by varying theamount of air admitted, for which purpose the openin or inlets d may beadjusted or controlleds individually or ointly by valves or dampers ofany wellnown or ap roved construction. Any unconsumed fue particles willbe ignited upon striking the highly heated and even incandescentportions of the conduit c, and particular] the ledge or ton e e.

The heatin mixture, aving a emperature of about 50 centigrade, travelslengthwise of the lower portion of the kiln, in the contracting channels.1, and also around the kiln b in the annular chamber k, to reach thedischarge ilue g. The wall of the kiln is thus heated to an average temerature of bout 450 centigade, and at t e time of caving the cham r il:the gases have cooled down to approximately 450 centigradi.

.In order to obtain a better utilization of the heatin gases, I maycause them to ass throu h a eat-exchange up aratus on t ezr way rom theheating chum r k to the discharge llue g to give up part of'their heatto the air whic is on its way to the inlets d. In this manner thetemperature of the ses may be reduced to about 150 centigra e beforethey enter the disc flue.

Various modifications may be made without departing from the nature ofmy. invention as set forth in the appended claims.

I claim:

1. The process o f heating rotary kilns for the distillation of coal andother bituminous materials, which consists in reducing combastion .i :t:of com arative y ature, u mixin em wit air of lower temperature, and ten.brin 'ng the mixtuie thus cooled into contact with the kiln.

2. .The process of heating rota kilns for the distillation of coal andother ituminous materials, which consists in reducing combustion gasesof com arativ y high temperature, then mixing em wi* h a gaseous mediumof lower temperature,I and then brin ing the mixture thus cooled lintocontact'wit the kiln.

3. The process of heating totals 'kilns for the distillation of coal andother ituminous materials, which consists in reducing combastion ofcomparative y high tem erature, en mixing them with a ilui of lowertemperature, and then bringi the piture thus cooled into contact wit theY4. The process of heating rotarlg1 kilns for the distillation of coaland other ituminous materials, which consists in producin combastion,gases of comparatively higi temperature, then mixing them with a fluidof high temperlower temperature to obtain a. mixture of about 750centigrade, and then bringin such mixture into contact with the kiln.

5. The process of heating rotary kilns for the distillation of coal andother bituminous materials, which consists in producing comd bastion`ases of comparative y high tem ature, t en mixing them with a flui foflower temperature to obtain a mixture of about 750 centigrade, thenbringi slich.Y mixture into contact `with the kiln, an thereupon coolingthe used mixture to a temperature of about 150 by bringing it intoeat-exchange relation to the Said fluid while the latter is on its wayto be mixed with the combustion gases.

6. A device for heatin rotary kilns, coinprisingn a combustion ciamber,a conduit eadin therefrom in a plane erpendicular to the ongitudinalaxis of the kiln, channels extendin laterally from said conduit on oposlte si es thereof adjacent to the kiln and' engthwise thereof, tonguesextendi len fthwse of the kiln on opposite sides o said channels, anannular chamber surrounding the kiln and communicating with sadchannels, and a discharge flue conununicacing with said annular chamberand extending from a point adjacent to one of said tongues.'

7. A device for heatin rotary kilns, com.- prising a combustion c amber,a conduit eading therefrom in a plane perpendicular to the'lon itudinalaxis of the kiln, channels exten ing laterali from said conduit onopsosite sides thereo adjacent to the kiln lengthwise thereof, saidchannels being provide .with inlets for a coolin medium.

8. A device for heatin tures, comprising a com conduit leading therefromtoward the central portion o the structure to be heated, spaced tonguesextending lengthwise of said structure adjacent thereto, lateralchannels located between said tongues and communieating with saidconduit, said channels having inlets for a cooling medium, an annularchamber communicating with said channels and extendin around saidstructure, and

ustion chamber, a

a dlscharge ue extending from said annular chamber adjacent to one ofsaid tongues.

9. A device for heating kilns or like structures, comprising acombustion chamber, a. conduit "leadm therefrom toward the cen- -tra]portion o the structure to be heated spaced tongues extending lengthwiseof sai structure adjacent thereto, lateral channels extending inopposite directions from said conduit and contracted away from suchconduit, said channels terminating adjacent to said structure betweensaid tongues, and having inlets for a cooling medium, an annular chambersur! ounding said structure and communicating with said channels, and akilns or ike strucv discharge flue extending from said annular conduit,an annular chamber surrounding chamber adjacent to one of said tongues.the kiln and communicating with said chan 10. A device for heatingrotary kilns, comnel, and a discharge flue extendimz` from said rising acombustion chamber, a conduit annular chamber adjacent to thefirst-named eadng therefrom, spaced tongues extending tongue, 0n theside thereof opposite to said 15 lengthwise of the kiln, one of saidtongues channel. extending close to the periphery of the kiln, Intestimony whereof I have hereunto set and the other terminating at agreater dismy hand. tance therefrom, a channel located between 10 saidtongues and communicating with said HANS HOLZWARTH.

